Method for producing hot stamping forming bulletproof piece

A technology of hot stamping forming and production method, which is applied in the technical field of bulletproof parts, and can solve the problems of increased weight, decreased anti-ballistic performance of welded seams, and high rejection rate.

Active Publication Date: 2017-08-22
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When producing bulletproof parts, especially bulletproof parts for vehicles, due to the high strength of bulletproof steel plates, they are usually produced by cutting, tailor welding, etc., sometimes with simple bending and forming, which eventually leads to parts (such as bulletproof hubcaps). It is made of overlapping steel plates, which not only increases the weight, but also reduces the ballistic performance of the weld seam sharply.
Some bulletproof parts (such as the roof of the vehicle escape cabin, bulletproof vest inserts, and bulletproof shields) are produced by cold forming first and heat treatment to obtain bulletproof performance. During heat treatment, the quenching deformation is large and the scrap rate is high.
Sometimes the steel plate is processed into a bulletproof steel plate first, and then forced to be formed by cold forming, which not only requires extremely high production capacity of the equipment, but also increases the residual stress caused by deformation in the bulletproof parts to reduce the bulletproof performance. High strength steel plate and poor formability lead to limited shape

Method used

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  • Method for producing hot stamping forming bulletproof piece
  • Method for producing hot stamping forming bulletproof piece
  • Method for producing hot stamping forming bulletproof piece

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: implement the product and the method of the production method of a kind of hot stamping bulletproof part of the present invention as follows: be the 30CrNiMo steel plate of 2.3mm to produce the bulletproof escape compartment top cover with thickness, after laser blanking, steel plate is in box-type electric furnace The quenching heating temperature is 880-920°C, the holding time is plate thickness × (2-3) min / mm, it is transferred to the mold within 10s for stamping, the holding pressure is 400 tons, cooling water is passed through the mold, and the parts are stamped during the stamping process. The average cooling rate is 53°C / s (cooling curve such as figure 1 shown), the holding time is 30s, and then tempered at 200 °C, and the holding time is plate thickness × 3min / mm. The detected hardness and tensile test data are shown in Table 1. The target test results prove that this part can protect the penetration of Type 51B pistol bullets fired by Type 79 sub...

Embodiment 2

[0026] Embodiment 2: implement the product and the method of the production method of a kind of hot stamping forming bullet-proof part of the present invention as follows: be that the 40CrNiMo steel plate of thickness 6.2mm is used to produce bullet-proof clothing insert plate, after steel plate is blanked, heat at 900 ℃, holding time Thickness × (2 ~ 3) min / mm, it has been sent to the mold for stamping within 5s, cooling water is passed through the mold, the cooling rate is 40°C / s, the holding pressure is 400 tons, and the holding time is 30s. Then temper at 200°C, and the holding time is plate thickness × 3min / mm. The detected hardness and tensile test data are shown in Table 2. The target test results prove that the part can protect against the penetration of the 7.62mm NATO bullet fired by the M14 rifle according to the UL752-8 standard. Photos of parts such as Figure 4 As shown, compared with the production mode of traditional first cold forming before heat treatment a...

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Abstract

The invention discloses a method for producing a hot stamping forming bulletproof piece. According to the hot stamping forming bulletproof piece, a bulletproof steel plate with the thickness being larger than 1.8mm is heated to a fully-austenitic area at first and then is stamped to be in a certain shape; and meanwhile, quenching is achieved by means of rapid cooling in the forming process so that the bulletproof piece can achieve a super-strength mechanical property, for example, the tensile strength is not lower than 1550MPa, and the capacity of resisting bullet shooting or breaking is achieved. The method is characterized by including the following steps that the bulletproof steel plate with the thickness being larger than 1.8mm is heated to be fully austenitic and then is subjected to mold hot stamping forming so that the bulletproof piece can be formed, austenite is synchronously quenched into martensite in a mold, the mold is provided with a quenching device used for cooling the bulletproof piece, flowing cooling media are contained in the quenching device, and the bulletproof piece is cooled below the martensite transformation finishing temperature Mf through the cooling media to be turned into a martensite bulletproof piece.

Description

technical field [0001] The present invention relates to bullet-proof parts technology, in particular to a production method of hot-stamped bullet-proof parts. The hot-stamped bullet-proof parts refer to heating a steel plate with a thickness greater than 1.8mm to a complete austenitic region, and then punching it into a certain shape. At the same time, quenching is achieved through rapid cooling during the forming process, so that the bulletproof parts can obtain ultra-high-strength mechanical properties, for example, the tensile strength is not less than 1550MPa, and it has the ability to resist bullets or fragments. Background technique [0002] Bulletproof parts usually have a certain shape and can be used for vehicle bulletproof, bulletproof vest inserts, bulletproof shields and other personal protection ranges. When producing bulletproof parts, especially bulletproof parts for vehicles, due to the high strength of bulletproof steel plates, they are usually produced by c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00B21D22/02
Inventor 王存宇董瀚赵仕豪范建文陈鹰刘剑辉
Owner CENT IRON & STEEL RES INST
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